Ah, the iconic games of our youth. We humbly sit at the 256th level of Pac-Man, proud of our meager ach—WHAT THE HELL HAPPENED TO THE SCREEN?!
Yep, the Kill Screen, enemy of completionists of yore. The result of an Endless Game being played for such a long time without a Game Over, and the player advancing so far that an internal counter (like the current level number) reaches its inherent limit [...] [tvtropes.org]